How do I set an axis interval?

Sep 18, 2009 at 11:32 AM

My X-axis are dates shown as dd-MMM-yyyy.

I need to set the interval to "1" so there is an axis label/tick mark for each day. At the moment it shows every 5 days,

e.g. 23-Sep-2009, 28-Sep-09, etc

But what I really want is

23-Sep-2009, 24-Sep-2009, 25-Sep-2009,etc.